System harmonic impedance acquiring method and system

A technology of harmonic impedance and acquisition method, which is applied in the measurement of resistance/reactance/impedance, measurement devices, instruments, etc., to achieve the effect of simplifying analysis, improving analysis efficiency, and avoiding modal aliasing

Inactive Publication Date: 2020-03-17
PANZHIHUA POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER
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Problems solved by technology

[0004] The simultaneous coefficient is not only related to the harmonic emission characteristics of the harmonic source, but also related to the number of harmonic sources on the same bus. In addition, the simultaneous coefficient may also be related to the season, and different harmonic orders may also have different simultaneous coefficients, which need to be considered. factors and discuss the simultaneous coefficients in different harmonic orders, so it is difficult

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[0032] Such as figure 1 As shown, a method for obtaining system harmonic impedance in the present invention includes the following steps: S1: obtain the harmonic signals of wind power plants and photovoltaic power stations connected to the grid, and suppress self-excited oscillation for the harmonic signals to generate preprocessing Harmonic signal; S2: use the Fokker-Planck equation to construct a filter function, and decompose the preprocessed harmonic signal according to the filter function to obtain a periodic component; S3: perform Hilbert on each component in the periodic component Harmonic characteristic parameters are extracted after transformation and obtained according to the harmonic characteristic parameters; the harmonic characteristic parameters include frequency, amplitude and phase.

[0033] When this embodiment is implemented, the pre-processing harmonic signal is first generated. The pre-processing signal needs to suppress the harmonics of the photovoltaic gr...

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Abstract

The invention discloses a system harmonic impedance acquiring method and system. The method comprises the steps: S1, acquiring harmonic signals of a wind power plant and a photovoltaic power station after grid connection and carrying out inhibition of self-oscillation of the harmonic signals to generate a preprocessing harmonic signal; S2, constructing a filtering function by adopting a Fokker-Planck equation and decomposing the preprocessed harmonic signal according to the filtering function to obtain a periodic component; and S3, performing Hilbert transform on each component in the periodiccomponents, extracting harmonic characteristic parameters, and acquiring the harmonic characteristic parameters according to the harmonic characteristic parameters including the frequency, amplitudeand phase. According to the system harmonic impedance acquiring method and system, the harmonic impedance analysis of the power system is simplified; the modal aliasing problem existing in an empirical mode decomposition algorithm can be effectively solved; and the analysis efficiency of the harmonic impedance is improved.

Description

technical field [0001] The invention relates to electrical engineering technology, in particular to a method and system for acquiring system harmonic impedance. Background technique [0002] At present, the non-stationarity and complexity of the harmonic components of the power system caused by a large number of nonlinear loads and the wide application of power electronic equipment are increasingly prominent, and there are problems that are difficult to identify and detect [0003] The existing power system harmonic analysis needs to deduce the mathematical theoretical formula of harmonic superposition under the condition of unknown phase, obtain the relationship between the amplitude square of the total harmonic and each superimposed component, and establish the amplitude square of the total harmonic Theoretical derivation of the functional relationship with the cosine expectation of the phase angle difference between the two superposition components is somewhat difficult. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R23/165
CPCG01R23/165G01R27/02
Inventor 戴炜苟家波王清明
Owner PANZHIHUA POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER
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